The production department of Zan Corporation has submitted the following forecast of units to be produced by quarter for the upcoming fiscal year: In addition, 6,000 grams of raw materials inventory is on hand at the start of the 1st Quarter. Each unit requires 8 grams of raw material that costs $1.20 per gram. Management desires to end each quarter with an inventory of raw materials equal to 25% of the following quarter's production needs. The desired ending inventory for the 4th Quarter is 8,000 grams. Required: [6 marks] 1. Calculate the estimated grams of raw material that need to be purchased each quarter.[ 4 Marks]